Armor piercing projectile cap



March 29, 1949. A. H. STONE ARMOR PIERCING PBOJECTILE c P" Fil ed Sept. 27, 1944 Arthur H 5i an E @mamm flyinadw Patented Mar. 29, 1949 are ARMUR PIERCING PROJECTILE CAP Arthur H. Stone, Birmingham, Mich, assignor to General Motors Corporation, Detroit, Mich, a corporation of Delaware Application September 27, 1944, Serial No. 556,013

3 Claims.

My invention relates to improvements in armor piercing projectile caps and its general object is to provide a cap of this character which will enalole the projectile on which the cap is mounted to pierce armor plate, and particularly when such armor plate is struck by the projectile at a wide angle.

A further object of my invention is to provide an armor piercing projectile cap of this character provided on its nose with transverse concavities whose edges with the material of the cap form sharp cutting shoulders, whereby piercing action of the cap is greatly facilitated, whether or not the armor to be pierced is struck at a wide or narrow angle.

With these and other objects in view, as will hereinafter more fully appear and which will be more particularly pointed out in the appended claims, reference is now made to the accompanying drawings forming a part of this application, in which:

Figure 1 is a longitudinal sectional elevation view of the forward part of a projectile, my improved armor piercing projectile cap being shown in section, while the nose of the projectile appears in elevation; and

Figure 2 is an end elevation, showing the front end of my improved armor piercing projectile cap.

Referring now to the drawings in which similar reference characters represent similar parts, the numeral 2 designates the nose of a conventional projectile, to which is secured by any of the means well known in the art, my improved armor piercing projectile cap G. The cap i is provided with an annular groove 6, in which groove a conventional windshield, not shown, is adapted to be secured. The nose of the cap l is provided with oppositely disposed, transverse concavities 8 and I0. Concavity 8 forms forward facing shoulder 12 and sideward facing shoulder It, while concavity lll forms similar forward and sideward facing shoulders I6 and [8.

Experimental firing tests have demonstrated that by the use of my improved armor piercing cap, armor may be successfully pierced when the The formation of sharp cutting shoulders at the point of intersection between the edges of the cavities and the material of the cap adjacent the cavities provide gripping surfaces that facilitate the piercing of the armor upon a wide angle of obliquity.

While I have illustrated and described the invention in some detail, it is to be understood that the invention is not to be limited to such details, but only by the spirit of the invention and the scope of the appended claims.

I claim:

1. An armor piercing cap for a projectile, said cap being formed as a portion of the surface of a sphere, said surface having spaced cavities formed by the intersection with said spherical surface of a pair of equal cylinders having their parallel axes normal to and equally spaced upon opposite sides of the central diametrical axis of said cap.

2. The structure of claim 1 in which sharp cutting shoulders are formed at the point of intersection between the edges of the cavities and the material of the cap adjacent the cavities to facilitate gripping action between the cap and armor plate.

3. In an armor piercing projectile cap having an ogival nose, a plurality of diametrically spaced transverse non-communicating cavities on the opposite sides of said nose, said cavities being formed by the intersection with the surface of said cap of a pair of equal cylinders having their parallel axes normal to and equally spaced upon opposite sides of the central axis of said cap, there being formed at the point of intersection between the edges of the cavities and the material of the cap adjacent the cavities, sharp cutting shoulders to facilitate gripping action between the cap and armor plate.

ARTHUR H. STONE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS oblique angle of contact is 10 wider than such N mb r Name Date piercing can be effected by any other known pro- 71 4 1 Kennedy t, 11, 1337 iectile usin ny yp of p je il p known in 1,076,419 Hadfield Oct. 21 1913 the art. 1,089,639 Hadfield Mar. 10, 1914 The cap illustrated in the drawings is a scale 1,169,704 Wesner Jan. 25, 1916 model of my invention used in the experimental firing tests referred to above. FOREIGN PATENTS Applicant is aware of the fact that various Number Country Date roughened and other surfaces have heretofore 1,334 Great Britain 1863 been used on projectile caps, but none of these 313,355 Italy Dec. 23, 1933 caps will produce the efiect of my improved cap. 

